[alsa-devel] (SoC) Does i.MX27's SSI work as I2S clock master?

ngc ngc at drvlabo.jp
Sun Nov 30 23:47:54 CET 2008


I found some mistakes.
- AUDMUX configuration : Tx clock/fs direction
  I noticed this mistake when checking i.MX21's applicaton note #2628.
  The descriptions in the reference manual is very hard
  to understand the AUDMUX's specfications.
- in ADS board, TOUT/SSI2_MCLK is used to
  receive IRQ from MC13783,
  there is a conflict and the pin configuration was
  overwritten when register IRQ handler.

After correct the above mistakes, I could see the signals:
But, still I have a problem.
Though I want to provide an oversampling clock with MCLK to the codec
now the frequency of MCLK is same as SSI_CLK.
Can't the MCLK provide the oversampling frequency?

> Now I'm porting WM8728 driver with i.MX27ADS, based on Freescale's BSP
> kernel(2.6.22) and refering to ALSA SoC git repository.
> I checked SSI-3 signal set with an oscilloscope,
> no clock signal appears on SSI3_CLK.
> I tried the various SSI setting, I2S normal, I2S master,
> asychronous/synchronous, normal mode/network mode, ...
> But, I can't see clock signal, yet.

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